JS调用MD5加密
为了系统的安全，前端一般需要对密码进行MD5加密，然后传输给后台处理。MD5的英文是Message Digest Algorithm（信息摘要算法），是不可逆的算法，只能通过暴力破解，所以较为安全。
需要引入md5.js，代码如下：
1 var hexcase = 0; 2 var b64pad = ""; 3 var chrsz = 8; 4 function hex_md5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));} 5 function b64_md5(s){ return binl2b64(core_md5(str2binl(s), s.length * chrsz));} 6 function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); } 7 function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); } 8 function calcMD5(s){ return binl2hex(core_md5(str2binl(s), s.length * chrsz));} 9 10 function md5_vm_test() 11 { 12 return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"; 13 } 14 15 function core_md5(x, len) 16 { 17 18 x[len >> 5] |= 0x80 << ((len) % 32); 19 x[(((len + 64) >>> 9) << 4) + 14] = len; 20 var a = 1732584193; 21 var b = -271733879; 22 var c = -1732584194; 23 var d = 271733878; 24 for(var i = 0; i < x.length; i += 16) 25 { 26 var olda = a; 27 var oldb = b; 28 var oldc = c; 29 var oldd = d; 30 31 a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936); 32 d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586); 33 c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819); 34 b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330); 35 a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897); 36 d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426); 37 c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341); 38 b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983); 39 a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416); 40 d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417); 41 c = md5_ff(c, d, a, b, x[i+10], 17, -42063); 42 b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162); 43 a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682); 44 d = md5_ff(d, a, b, c, x[i+13], 12, -40341101); 45 c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290); 46 b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329); 47 a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510); 48 d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632); 49 c = md5_gg(c, d, a, b, x[i+11], 14, 643717713); 50 b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302); 51 a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691); 52 d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083); 53 c = md5_gg(c, d, a, b, x[i+15], 14, -660478335); 54 b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848); 55 a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438); 56 d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690); 57 c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961); 58 b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501); 59 a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467); 60 d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784); 61 c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473); 62 b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734); 63 a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558); 64 d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463); 65 c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562); 66 b = md5_hh(b, c, d, a, x[i+14], 23, -35309556); 67 a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060); 68 d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353); 69 c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632); 70 b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640); 71 a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174); 72 d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222); 73 c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979); 74 b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189); 75 a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487); 76 d = md5_hh(d, a, b, c, x[i+12], 11, -421815835); 77 c = md5_hh(c, d, a, b, x[i+15], 16, 530742520); 78 b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651); 79 a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844); 80 d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415); 81 c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905); 82 b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055); 83 a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571); 84 d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606); 85 c = md5_ii(c, d, a, b, x[i+10], 15, -1051523); 86 b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799); 87 a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359); 88 d = md5_ii(d, a, b, c, x[i+15], 10, -30611744); 89 c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380); 90 b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649); 91 a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070); 92 d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379); 93 c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259); 94 b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551); 95 96 a = safe_add(a, olda); 97 b = safe_add(b, oldb); 98 c = safe_add(c, oldc); 99 d = safe_add(d, oldd); 100 } 101 return Array(a, b, c, d); 102 103 } 104 105 function md5_cmn(q, a, b, x, s, t) 106 { 107 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b); 108 } 109 function md5_ff(a, b, c, d, x, s, t) 110 { 111 return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t); 112 } 113 function md5_gg(a, b, c, d, x, s, t) 114 { 115 return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t); 116 } 117 function md5_hh(a, b, c, d, x, s, t) 118 { 119 return md5_cmn(b ^ c ^ d, a, b, x, s, t); 120 } 121 function md5_ii(a, b, c, d, x, s, t) 122 { 123 return md5_cmn(c ^ (b | (~d)), a, b, x, s, t); 124 } 125 126 function core_hmac_md5(key, data) 127 { 128 var bkey = str2binl(key); 129 if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz); 130 131 var ipad = Array(16), opad = Array(16); 132 for(var i = 0; i < 16; i++) 133 { 134 ipad[i] = bkey[i] ^ 0x36363636; 135 opad[i] = bkey[i] ^ 0x5C5C5C5C; 136 } 137 138 var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz); 139 return core_md5(opad.concat(hash), 512 + 128); 140 } 141 142 function safe_add(x, y) 143 { 144 var lsw = (x & 0xFFFF) + (y & 0xFFFF); 145 var msw = (x >> 16) + (y >> 16) + (lsw >> 16); 146 return (msw << 16) | (lsw & 0xFFFF); 147 } 148 149 function bit_rol(num, cnt) 150 { 151 return (num << cnt) | (num >>> (32 - cnt)); 152 } 153 154 function str2binl(str) 155 { 156 var bin = Array(); 157 var mask = (1 << chrsz) - 1; 158 for(var i = 0; i < str.length * chrsz; i += chrsz) 159 bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32); 160 return bin; 161 } 162 163 function binl2hex(binarray) 164 { 165 var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"; 166 var str = ""; 167 for(var i = 0; i < binarray.length * 4; i++) 168 { 169 str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) + 170 hex_tab.charAt((binarray[i>>2] >> ((i%4)*8 )) & 0xF); 171 } 172 return str; 173 } 174 175 function binl2b64(binarray) 176 { 177 var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; 178 var str = ""; 179 for(var i = 0; i < binarray.length * 4; i += 3) 180 { 181 var triplet = (((binarray[i >> 2] >> 8 * ( i %4)) & 0xFF) << 16) 182 | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 ) 183 | ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF); 184 for(var j = 0; j < 4; j++) 185 { 186 if(i * 8 + j * 6 > binarray.length * 32) str += b64pad; 187 else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F); 188 } 189 } 190 return str; 191 }
用法：将密码作为hex_md5的参数传入，即可加密成功，如以下代码所示：
1 var data = { 2 originPassword:hex_md5($('.oldPwd').val()), 3 password:hex_md5($('.newPwd').val()) 4 }
